Canadian Patent Database
CIPO's Canadian Patent Database: access over 75 years of patent descriptions and images (August 15, 1978 to present.) Search, retrieve and study more than 1,400,000 patent documents.

Canadian Intellectual Property Office (CIPO)
The Canadian Intellectual Property Office (CIPO), a Special Operating Agency (SOA) associated with Industry Canada, is responsible for the administration and processing of the greater part of intellectual property in Canada. CIPO's areas of activity include: patents, trade-marks, copyrights, industrial designs, and integrated circuit topographies.
(CIPO)The Canadian Intellectual Property Office (CIPO), a Special Operating Agency (SOA) associated with Industry Canada, is responsible for the administration and processing of the greater part of intellectual property in Canada. CIPO's areas of activity include: patents, trade-marks, copyrights, industrial designs, and integrated circuit topographies.

U.S.

US Patent and Trademark Office (US PTO)
Search for US patents and trademarks. Full text coverage from 1976; 1790-1975 is searchable by patent number and classification only. The PTO promotes the progress of science and the useful arts by securing for limited times to inventors the exclusive right to their respective discoveries (Article 1, Section 8 of the United States Constitution).

Patent2pdf.org
Download and print PDF images of US patents. You must search using a patent number.

Freepatentsonline
Fulltext and images of US patents beginning with patent number 4,000,000

FreshPatents.com
"The latest published US patent applications each week BEFORE the USPTO decision to grant/deny.".

Delphion Research Intellectual Property Network
Search for and purchase international and US patents from Delphion, Inc. Users will need to register (it’s free) in order to view results. Users are responsible for all fees incurred should you choose to order a patent from Delphion.

UK Patent Office database
Over 30 million documents together with databases of documents from Japan, the World Intellectual Property Organization, the European Patent Office and from 19 European countries including Great Britain.

CAMBIA PatentLens
"...an independent, public good global resource for increasing patent transparency. The Patent Lens contains patent documents from the European and United States patent offices and filed under the Patent Cooperation Treaty (PCT) in a format that is fully integrated and searchable."

IP Newsflash
"...search for patent families complete with their legal status based on INPADOC data."